I just read this note that came out in April:
http://www.sciencedaily.com/releases/2008/04/080424140410.htm
I had to wonder if any of the students in the study were CS students
that had gone through HtDP/C. Probably not, because such students
would likely have learned all the lessons well and would have been
able to apply them to problems in a different context. Interestingly
enough, the authors did not test teaching abstractly first followed by
concrete examples.
--
Cheers,
Marco